build: only Scala 3

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [3, 2.13]
+        scala: [3]
         java: [temurin@17]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -122,16 +122,6 @@ jobs:
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (2.13)
-        uses: actions/download-artifact@v4
-        with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13
-
-      - name: Inflate target directories (2.13)
-        run: |
-          tar xf targets.tar
-          rm targets.tar
-
       - name: Import signing key
         if: env.PGP_SECRET != '' && env.PGP_PASSPHRASE == ''
         env:
@@ -186,7 +176,7 @@ jobs:
       - name: Submit Dependencies
         uses: scalacenter/sbt-dependency-submission@v2
         with:
-          modules-ignore: root_3 root_2.13
+          modules-ignore: root_3
           configs-ignore: test scala-tool scala-doc-tool test-internal
 
   validate-steward:

.mergify.yml

@@ -13,7 +13,6 @@ pull_request_rules:
     - body~=labels:.*early-semver-patch
     - body~=labels:.*early-semver-minor
   - status-success=Build and Test (ubuntu-latest, 3, temurin@17)
-  - status-success=Build and Test (ubuntu-latest, 2.13, temurin@17)
   actions:
     merge: {}
 - name: Label unum PRs

build.sbt

@@ -3,7 +3,6 @@ import deps._
 Global / onChangedBuildSource := ReloadOnSourceChanges
 Global / lintUnusedKeysOnLoad := false
 
-lazy val Scala2 = "2.13.13"
 lazy val Scala3 = "3.4.1"
 
 lazy val root = project
@@ -23,7 +22,7 @@ lazy val unum = project
 inThisBuild(
   List(
     scalaVersion := Scala3,
-    crossScalaVersions := Seq(Scala3, Scala2),
+    crossScalaVersions := Seq(Scala3),
     tlJdkRelease := Some(8),
     tlBaseVersion := "1.2",
     tlSonatypeUseLegacyHost := false,